Electric furnace



Oct. 30, 1923. 1,472,139

T. A. REID ELECTRI C FURNACE Filed Nov. 2, 1921 INVENTOR Thomas/4. Reid ATTORNEY fill UNITED STATES PATENT OFFICE.

THOMAS A. REID, OF WILKINSBUBG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & HANUFACTUR ING COMPANY, A CORPORATION OF PENNSYLVANIA.

ELECTRIC FURNACE.

Application filed November 2, 1921. Serial Io. 512,188.

To all whom it may cmwcm:

Be it known that I citizen of the Unit of \Vilkinsbur i and State of 1 ennsylvania,

new and useful Furnaces, of which the fication.

y and particularly naces and it has relatively simple sistor mounting furnace.

In practisin a plurality o {spaced sets 0 THOMAS A. Rare, a tates, and a resident n the county of Allegheny have inven a Improvement in Electric following is a speciinvention relates to electric furnaces to electric-resistance furfor its object to provide a form of resistor and a refor an electric-resistance I provide my invention refractory members of substantially T-shape supported by the roof or walls of the member is provided with a the contiguous faces imme furnace. Each groove in each of iately inside of the inner surface of the member, the two rooves registering to IS placed a relatively be r.

form a slot in which heavy resistor rod or In the single sheet of drawings,

Figure 1 is a cross section,

the device embodyin mg ta en on the line Fig. 2 is a pa section of a furnace my invention taken on the line cmbodyin II-II of ig. 1.

An electric furnace lic skeleton casing or view, in vertical lateral of an electric furnace comprismy invention, I-I of ig. 2, and

rtial longitudinal vertical comprising the device comprises a metalframe 11, a plurality of supporting members 12, an outer lining 13 consisting of bricks able refractory heat-insulating disposed to form walls and a roof. prises a suitable tory material. The two linings are furnace chamber 15 of any suitto form a.

able or desired contour The bricks comprisin art at suita erebetween, the ends of the refractory blocks immediately ad cess 16 having overhanging s tions so that the space is T-shape in cross-section. fractory members 17,

are spaced a a recess 16 t shape have their pllu rality igh-temperaturercsist1ng refracor blocks of a suit material and a bottom and outer side An inner lining 14 comof bricks or blocks of a disposed and dimensions.

the inner lining 14 le intervals to form 'acent the reoulder porof substantially A plurality of resubstantially of T- outer ends located in the recesses 16 and their inner narrow ends projecting into the furnace chamber 15. In the roof of the furnace the members 17 may be so shaped as to permit of their being built up to form a substantially self-supporting arch. A slot 18 is formed in each of the contiguous faces of each of the refractory members 17 immediately inside of the inner surface, the two slots registering to form 0 nin s through the set of refractory members. Vhile I have illustrated the openings formed by the adjacent and registering slots 18 as substantially rectangular in contour, any desired contour of opening ma be obtained by suitably shaping each of the registering s ots.

A resistor member, composed of a lurality of relatively heavy and unyielding bars or rods 19 is located in the openings formed by the registering slots, the contour of the cross section of the member 19 being such as to substantially fill the opening in which it is located. I may use a plurality of substantially straight bars 19, which may. be connected by means of short cross-connecting members 21- secured thereto by means of bolts 22 and nuts 23, or I mayuse a plurality of two-part resistor units, each unit comprisin two inte al end-connected and substantia 1y paral el-extending convolutions The sets of refractory supporting members 17 are spaced apart a suitable distance, and the resistor members 19 are sufliciently heavy to permit them to be substantially self-supportingmbetween the refractory sup rtin mem rs. The resistors may extend t roug the rear wall of the furnace so that the connectors 21 may be located outside of the furnace, if desired.

The resistor members 19 may be moved into their 0 rative position b movement longitudinal y of the furnace c mber and of the resistor member, after which the cross connecting'members may be bolted in place. In case of damage to a resistor member, the reverse operation permits of easily and quickly removin the same.

The device em odying my invention pro vides a relatively simple form of a relatively heavy and unyielding resistor member and of a supporting means therefor, wherein the resistor member is moved longitudinally of its length to insert it in its proper operative position in the furnace.

Various modifications may be made in the device embodying my invention without departi from the irit and scope thereof and I esire tbat' ysuchlimitationelhall beplacedthereonaeareimpoaed bytla prior art or are specifically set forth an the ap nded claims.

claim as my invention:-

1. Inhtan electrifis furnace, in combination, a lur of w spaced rt to en use a furnaca chamber, a plurfiizy of at sets of refractory members of T i. hav' their narrow ends projecting into said b-elr and each a transversely exten otineacho two op its and f resrsto' r member extendi time said slots and between and beyon said sets of refractory members.

-2. In an electric furnace, a plurality of walls spaced a art to enclose a furnace chamber, a plura ity of spaced sets of re members of T-shape supported by said walls, having their narrow ends projecting into said chamber and having transversely extending slots in the contiguous faces, and a relatively heavy preformed resistor member extend thro h said slots between and beyond sets 0 refractory members to be supported thereby clear of said furnace walls.

3. In an electric furnace, in combination, a plurality of walls spaced a art to enclose a furnace chamber, a pl ity of spaced sets of refractory members of T-shape supported by said walls, having their narrow ends projecting into said chamber and having transversely extending slots in the contiguous faces, said slots combining to form an o nin of redetermined contour, and a pre orm re ativel heavy and unyielding resistor member aving a lateral cross-sectional contour substantially similar to that of said opening, extendi through said slots and between and beyon said sets of refractory members to be supported thereby clear of said walls.

in combination,

ends

4. In an electric furnace, in combination, a plurality of walls spaced a to enclose a furnace chamber, a plura ity of spaced sets of refractory members of T-shapc sugported by said walla, having'their narrow en 9 projecting into said chamber and having transversely extending'slots in the contiguous faces and a plurality of relatrvely heavy preformed resistor members, substantially of U-ehape, extcndin through said slots and between and beyonrf said sets of refractory members.

5. In an electric furnace, in combination, a plurality of walls spaced a art to enclose a furnace chamber, a plan ity' of spaced sets of refractory members of T-shape supported by said walls, having their narrow projecting into said chamber and having transversely extending slots in the contiguous faces, a p'urality of relatively heavy preformed resistor members, substantral y of U-shape, extendin through said slots and between and beyond said sets of refractory members, and means for electrically connectin said resistor members.

6. In an electric fnrnace,incomhination, a plurality of walls spaced a art to enclose a furnace chamber, a plura ity of spaced sets of relatively narrow refracto members of T-shape supported by said we is having their narrow ends rejecting into said chamber and havinf 3 ate in the contiguous faces extending ongitudinally of said chamber, and a relatively heavy, reformed resistor member substantially o U-shape extending through said slots and between and beyond said sets of refractory members and removable therefrom by a longitudinal movement of said resistor member.

In testimony whereof I have hereunto subscribed my name this 17th day of October, 1921.

THOMAS A. REID. 

